Answer:
19 books
Explanation:
Let the amount of books bought be x
If she spent a total of $71 after a discount of $5, the total amounshe spend on the books will be $76
If each book costs $4,
x books will cost $76
Cross multiply
1 * 76 = x * 4
76 = 4x
Rearrange
4x = 76
Divide both sides by 4
4x/4 = 76/4
x = 19
Hence she bought 19 books